*{box-sizing:border-box} body{margin:0;font-family:Georgia,serif;color:#16232f;background:#fff;line-height:1.65}
a{color:#0e5f5c} .topbar{background:#0e5f5c;color:#fff;padding:14px 20px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
.brand{font-size:26px;font-weight:bold;letter-spacing:.5px} .brand a{color:#fff;text-decoration:none}
.cta-btn{background:#c9a86a;color:#111;padding:10px 18px;border-radius:6px;text-decoration:none;font-weight:bold;display:inline-block}
.nav{background:#eef4f2;padding:0 20px} .nav-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:4px}
.nav-list li{position:relative} .nav-list a,.nav-list button{display:block;padding:12px 14px;text-decoration:none;color:#16232f;background:none;border:0;font:inherit;cursor:pointer}
.nav-list a:hover,.nav-list button:hover{background:#fff} .nav-menu{display:none;position:absolute;left:0;top:100%;background:#fff;border:1px solid #ccc;min-width:240px;z-index:20;list-style:none;margin:0;padding:0}
@media (hover:hover){.has-menu:hover > .nav-menu{display:block}} .has-menu.open > .nav-menu{display:block} .nav-menu a{padding:10px 14px}
.hero{background:#0e5f5c;color:#fff;padding:36px 20px} .hero-title{font-size:38px;margin:0 0 10px} .hero-sub{font-size:18px;max-width:760px}
.facts-bar{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0;padding:0;list-style:none} .facts-item{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.4);padding:8px 12px;border-radius:6px}
.route-line{display:flex;gap:10px;align-items:center;margin-top:18px} .route-node{width:16px;height:16px;border-radius:50%;background:#c9a86a} .route-dash{flex:1;border-top:2px dashed #c9a86a}
.main{max-width:980px;margin:0 auto;padding:24px 20px} .section{margin:28px 0} .section-title{font-size:24px;border-bottom:3px solid #c9a86a;padding-bottom:6px} .lead{font-size:18px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px} .card{border:1px solid #ccc;border-radius:8px;padding:16px;background:#eef4f2} .card-title{font-size:19px;margin:0 0 6px} .card-text{margin:0}
.table-wrap{overflow-x:auto} .spec-table,.glance-table{border-collapse:collapse;width:100%} .spec-table th,.spec-table td,.glance-table th,.glance-table td{border:1px solid #bbb;padding:9px;text-align:left}
.form{border:1px solid #ccc;border-radius:8px;padding:20px;background:#eef4f2} .field{margin:0 0 14px} .label{display:block;font-weight:bold;margin-bottom:4px} .input,.textarea{width:100%;padding:10px;border:1px solid #999;border-radius:5px;font:inherit} .textarea{min-height:120px}
.btn{background:#0e5f5c;color:#fff;border:0;padding:12px 22px;border-radius:6px;font-size:16px;cursor:pointer} .btn-primary{background:#c9a86a;color:#111}
.checklist{border:2px solid #c9a86a;border-radius:8px;padding:18px;background:#fffef5} .related{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0} .related-link{border:1px solid #0e5f5c;border-radius:20px;padding:6px 14px;text-decoration:none}
.footer{background:#0e5f5c;color:#fff;padding:28px 20px;margin-top:30px} .footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px;max-width:980px;margin:0 auto} .footer-col h3{margin-top:0} .footer-link{color:#fff;display:block;padding:3px 0}
.crumbs{font-size:14px;color:#555} .blog-list{list-style:none;padding:0} .blog-item{border-bottom:1px solid #ddd;padding:16px 0} .blog-excerpt{margin:6px 0} .note{background:#eef4f2;border-left:4px solid #c9a86a;padding:12px 16px} .caption{font-size:14px;color:#444} .figure{margin:18px 0} img{max-width:100%;height:auto} .figure img{max-width:100%;height:auto} .img-wrap img{max-width:100%;height:auto}
@media(max-width:640px){.hero-title{font-size:28px} .nav-menu{position:static}}

/* lang-switch (stage4): minimal, does not disturb header layout */
.lang-switch{display:inline-block;position:relative}
.lang-switch summary{cursor:pointer;list-style:none;font-weight:700;padding:6px 8px}
.lang-switch summary::-webkit-details-marker{display:none}
.lang-switch ul{position:absolute;right:0;top:100%;background:#fff;border:1px solid #ccc;list-style:none;margin:0;padding:0;min-width:150px;z-index:40}
.lang-switch ul li a,.lang-switch ul li span{display:block;padding:8px 12px}

/* Huanyang visual rebuild 2026-10-30 (CSS only, no copy change, no images) */
.main{max-width:920px}
.main p{line-height:1.75;margin:0 0 18px}
.section{margin:44px 0}
.section:nth-of-type(even){background:#eef4f2;padding:22px 24px;border-radius:10px}
.section-title{font-size:27px}
.card-grid{gap:20px}
.card{border-top:4px solid #c9a86a;box-shadow:0 2px 10px rgba(22,35,47,.08)}
.card-title{font-size:21px}
@media(min-width:641px){.nav-menu{min-width:480px;column-count:2;column-gap:0}.nav-menu li{break-inside:avoid}}
.footer-grid{max-width:1180px;grid-template-columns:280px 1fr}
.footer-col:nth-child(2){column-count:3;column-gap:24px}
.footer-col:nth-child(2) h3{column-span:all}
.footer-link{break-inside:avoid;padding:4px 0}
@media(max-width:900px) and (min-width:641px){.footer-col:nth-child(2){column-count:2}}
@media(max-width:640px){
.nav{padding:0 10px;position:relative}
.nav-list{gap:0}
.nav-list a,.nav-list button{padding:9px 10px;font-size:15px}
.has-menu{position:static}
.nav-menu{position:absolute;left:10px;right:10px;top:100%;min-width:0;max-height:60vh;overflow-y:auto;box-shadow:0 8px 24px rgba(22,35,47,.25)}
.footer-col:nth-child(2){column-count:1}
.section:nth-of-type(even){padding:18px 16px}
}
@media(max-width:640px){.footer-grid{grid-template-columns:1fr}}
@media(max-width:640px){.nav-list li.has-menu{position:static}}

/* lang-switch panel alignment fix (post-landing review 2026-11-01) */
.lang-switch ul{left:0;right:auto}